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use futures_core::Stream;

/// Conversion into a `Stream`.
///
/// By implementing `IntoStream` for a type, you define how it will be
/// converted to an iterator. This is common for types which describe a
/// collection of some kind.
///
/// [`from_stream`]: #tymethod.from_stream
/// [`Stream`]: trait.Stream.html
pub trait IntoStream {
    /// The type of the elements being iterated over.
    type Item;

    /// Which kind of stream are we turning this into?
    type IntoStream: Stream<Item = Self::Item>;

    /// Creates a stream from a value.
    fn into_stream(self) -> Self::IntoStream;
}

impl<S: Stream> IntoStream for S {
    type Item = S::Item;
    type IntoStream = S;

    #[inline]
    fn into_stream(self) -> S {
        self
    }
}